Re: Duel ISP BGP question

  We have a single AS and a single /16 and we advertise to multiple ISPs
via multiple routers. When (in testing) we drop one of the carriers, it
normally takes 90-120 seconds to get full reachibility back. We only use
the portion of traffic that was routing to us via that particular ISP
that we have torn down. When we get the ISP back, there is no downtime.

--Hammer--

On 10/5/2010 10:25 AM, Fake Name wrote:
> I did the command below on both routers after
>
> Clear ip bgp * on both routers. Odd....is it possible the IS is stripping
> off my as prepend I think my configuration is correct no?
>
>
>
>
> On Tue, Oct 5, 2010 at 11:14 AM, Carlos G Mendioroz<tron_at_huapi.ba.ar>wrote:
>
>> 2 or 3 minutes ?
>> Have you forced your new pollicy by doing a clear soft out ?
>>
>> Fake Name @ 5/10/2010 11:56 -0300 dixit:
>>
>>> I have two ISP's and two routers running BGP between them peering to my
>>> AS.
>>>
>>> Both routers peer with ISP routers and have an IBGP relationship between
>>> them.
>>>
>>> I put the following config into one router asuming my as is 1
>>>
>>> route-map aspend permit 30
>>> set as-path prepend 1 1 1 1 1 1 1 1
>>>
>>> router bgp 1
>>> neighbor x.x.x.x.remote-as 2
>>> neighborx.x.x.x. route-map aspend out
>>>
>>> This should append the as 1 and make it less perfered for traffic to come
>>> into the link via the best path algorithm when making the decision which
>>> route to choose from other AS's. We did this configuration and an hour
>>> later on the internet we where unable to see our as prepends from any of
>>> the
>>> looking glasses. How long in the real world will this update take to
>>> propergate via the looking glasses?
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
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>>>
>>>
>>>
>>>
>>>
>>>
>>>
>> --
>> Carlos G Mendioroz<tron_at_huapi.ba.ar> LW7 EQI Argentina
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

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Received on Tue Oct 05 2010 - 10:37:29 ART